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Debt Part 1 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument    
Total Debt $ 24,653 $ 28,137
Less: current portion (3,459) (3,566)
Long-Term Debt 21,194 24,571
Committed lines of credit 125,000  
Uncommitted lines of credit 87,173  
Letters of credit, Outstanding amount 3,249  
Commitment fees on unused lines of credit $ 275  
Indebtedness to EBITDA ratio 0.37 to 1  
EBITDA to interest expense ratio 64.39 to 1  
Aggregate maturities of outstanding debt including capital lease obligations    
2016 $ 4,097  
2017 3,958  
2018 3,807  
2019 1,704  
2020 11,646  
Thereafter 1,523  
Total minimum obligations 26,735  
Less: amount representing interest (2,082)  
Total 24,653 28,137
Prudential Investment Management, Inc. Private Shelf Agreement    
Debt Instrument    
Outstanding Borrowings 14,571  
Credit facility borrowings, Long-Term    
Debt Instrument    
Total Debt 24,571 28,000
Aggregate maturities of outstanding debt including capital lease obligations    
Total 24,571 28,000
Collateralized Debt    
Debt Instrument    
Total Debt 0 7
Aggregate maturities of outstanding debt including capital lease obligations    
Total 0 7
Capital lease obligations    
Debt Instrument    
Total Debt 82 130
Aggregate maturities of outstanding debt including capital lease obligations    
Total $ 82 $ 130